Unlike other moments during her pregnancy, Bey, 35, and her husband Jay Z, 47, have yet to make a public announcement.

“Bey and Jay are thrilled and have started sharing the news with their family and closest friends,” a source told PEOPLE. Beyoncé’s father Mathew Knowles confirmed the birth of the babies but shed no more light on the sexes or names.

When asked about the parenting techniques she used with her own daughters, Tina explained, “My biggest lesson was teaching them that what is on the inside counts more than what’s on the outside. I see [Beyoncé] passing it on, and it makes me really proud because that was my biggest lesson.”